“Between these alternatives there is no middle ground. The constitution is either a superior, paramount law, unchangeable by ordinary means, or it is on a level with ordinary legislative acts, and like other acts, is alterable when the legislature shall please to alter it.”
“It is emphatically the province and duty of the judicial department to say what the law is. Those who apply the rule to particular cases, must of necessity expound and interpret that rule. If two laws conflict with each other, the courts must decide on the operation of each.

So if a law be in opposition to the constitution; if both the law and the constitution apply to a particular case, so that the court must either decide that case conformably to the law, disregarding the constitution; or conformably to the constitution, disregarding the law; the court must determine which of these conflicting rules governs the case. This is of the very essence of judicial duty.

If then the courts are to regard the constitution; and the constitution is superior to any ordinary act of the legislature; the constitution, and not such ordinary act, must govern the case to which they both apply.”
“The judicial power of the United States is extended to all cases arising under the constitution. Could it be the intention of those who gave this power, to say that, in using it, the constitution should not be looked into? That a case arising under the constitution should be decided without examining the instrument under which it arises? This is too extravagant to be maintained.”
“Why does a judge swear to discharge his duties agreeably to the constitution of the United States, if that constitution forms no rule for his government? if it is closed upon him, and cannot be inspected by him?”…Marbury V Madison

“We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution.”…Abraham Lincoln

From WhiteHouse.gov.

“Our next Supreme Court justice

Justice Anthony M. Kennedy announced on June 27 that he would retire from the U.S. Supreme Court at the end of this month. Tonight, President Trump will be joined by Vice President Mike Pence and senior leaders from Congress as he announces his nominee to be our Nation’s 114th Supreme Court Justice.

In his first year, President Trump appointed a record number of Federal judges, each of whom is standing up for our rights. That record includes the confirmation of Justice Neil Gorsuch to the Supreme Court last year. In just a little more than a year on the bench, Justice Gorsuch has proven to be a crucial voice for restoring Constitutional principles to our government.

By appointing rule-of-law judges, President Trump has reshaped the judiciary. That work goes hand-in-hand with the President’s program to reduce the size and scope of government, which includes signing the largest tax cuts in history, implementing unprecedented regulatory reform, and promoting individual liberties and religious freedoms.”